This book is the first to provide an introductory overview to the concept of urban informality, taking an international perspective across the global North and South. It explores theoretical understandings of the term, and looks at how it affects ways of living, such as land use, housing and basic services, working lives and politics. Using a broad range of material to bring the topic to life, including non-conventional sources such as fiction, poetry, photography, interviews and other media the book helps students, practitioners and scholars develop learning and research on this topic. The book also includes interjections from diverse voices of practitioners, community activists and regional experts.